[TippeX]

hmm that sounds quite strange, first thing i'd do is do a virus scan, are you using the cracked launcher? are you loading any other mods that aren't from bethesda? (if so, uncheck them). might also be an idea to run a checkdisk on your drive, right click it in explorer, select properties, go to tools, select 'error checking' and have it check the drive.. also select it to fix any errors it finds... and again, if it finds anything (virus or disk error), then you might have to reinstall again, install patch etc.. something's definately messing with your system, and its hard to tell whether its virus / trojan or defective hard disk...